Friday
December 13, 2013

# Posts by Knights

Total # Posts: 336

Analytic Geometry - lengths?
Square ABCD has sides of length 4, and M is the midpoint of CD . A circle with radius 2 and center intersects a circle with radius 4 and center A at points P and D . What is the distance from P to AD? Please help - I drew the diagram, but looks kinda wierd, and dunno which lin...

Precalculus with Trigonometry
Using the law of cosines (and assuming alpha is between b and c), then a^2 = 10^2+16^2-2 * 10*16 * cos 20 a^2 = 356 - 320 * cos 20 Figure out cos 20, we get roughly 0.93969262078 we plug this in to get roughly 55.2983614 for side a. I don't know what else you mean....

Trigonometry - Cosine of angle
thanks a lot Steve!

Trigonometry - Cosine of angle
What is the cosine of the angle between two adjacent faces of a regular tetrahedron? (We define the angle between two intersecting planes as the angle between two intersecting lines, one in each plane, such that each line is perpendicular to the line at which the planes inters...

Computer Literacy
Using several synonymous terms in the search

Triangle inequality?
Two altitudes of a triangle have lengths 12 and 14. What is the longest possible length of the third altitude, if it is a positive integer? I tried using the triangle inequality but to no avail...how would I do this?

Math
D is correct 2/15 * 240 = 32

Ratio
uh.....it doesn't matter they look equally good. Usually you would swap it to show one item versus another. For example, it might be sugar in drink to water in drink 1:4. But it would be false to say 4:1. So, it is not really which looks better, but which one is right or not.

World History
I agree......

Analytic Geometry - Circles and Areas
Thanks a lot Steve!!

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